CN110243574A - The measuring device and method of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh - Google Patents
The measuring device and method of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
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Abstract
The measuring device of the invention discloses a kind of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh, including femto-second laser (1), by electrically-controlled liquid crystal wave plate (2), polarization beam splitter prism (3), half wave plate (4), (the 6 ultrashort pulse power constituted and polarization state adjust part for beam expanding lens (5) and fibre-coupled mirrors, high non-linearity polarization-maintaining photonic crystal fiber (7) and by fiber optic collimator beam expanding lens (8), first 50:50 light splitting piece (9), first reflecting mirror (10), transmissibility of adjustable attenuation piece (11), second reflecting mirror (12), adjustable space optical delay line 13 and the 2nd 50:50 light splitting piece (14) constitute that spectrum is relevant and detection part, the survey to fiber birefringence coefficient can be realized by the relative time delay that the method that spectrum is concerned with measures fast axle and slow-axis direction soliton Amount.It is accurate and reliable that the present invention can measure the variation of the double refractive inde of optical fiber, measurement result when wavelength continuously adjusts on a large scale.
Description
Technical field
The invention belongs to nonlinear fiber optics and Optical fibre parametric measurement field, in particular to a kind of polarization maintaining optical fibre is birefringent
The measuring device and method of coefficient.
Background technique
Since to be able to maintain light polarization state in transmission process constant for polarization maintaining optical fibre, fiber optic communication, Fibre Optical Sensor,
Non-linear optical field etc., which has, to be widely applied.Double refractive inde is one of the important parameter for measuring polarization maintaining optical fibre, accurate to measure
The double refractive inde of polarization maintaining optical fibre is for improving the traffic rate of coherent optical communication system, increasing the measurement of fibre optical sensor
The essence that can, probe into fiber nonlinear effect plays a significant role, the parameter during manufacturing simultaneously for polarization maintaining optical fibre
Optimal improvements have important feedback effect.Optical fiber is since its core diameter is relatively thin, birefringent characteristic is difficult vulnerable to the interference of external environment
With with its double refractive inde of traditional optical method for measuring.Further, since the development of nonlinear fiber optics technology, is based on full light
In the devices such as fine ultra-short Pulse Generator, ultrashort pulse compressor and ultrashort pulse amplifier, the pulse width of ultrashort pulse,
Peak power is high, energy density is big, has a certain impact to the double refractive inde tool of optical fiber, and uses traditional optical measurement skill
Art is not capable of measuring the variation of the fiber birefringence coefficient under such high-energy density.Therefore, how optical fiber is accurately and quickly measured
Double refractive inde, it is difficult to become technology urgently to be solved for the double refractive inde of optical fiber especially in nonlinear fiber optics field
Topic.
Summary of the invention
Of the existing technology in order to overcome the problems, such as, the invention proposes one kind to measure polarization maintaining optical fibre based on soliton self-frequency sh
The device and method of double refractive inde are passed through using the feature of polarization maintaining optical fibre fast axle orphan and the same spectrum of slow axis orphan, different time sequence
Relative time delay between the relevant method detection polarization maintaining optical fibre output fast and slow axis orphan of spectrum, and then calculate its double refractive inde.
Since soliton has the characteristics that pulse width is narrow, peak power is high, wavelength can continuously adjust on a large scale, may be implemented to protect
Double refractive inde measurement under the fine wide wave-length coverage of polarisation, strong electrical field, short length.
A kind of measuring device of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh of the invention, including femtosecond laser
Device 1 is made of electrically-controlled liquid crystal wave plate 2, polarization beam splitter prism 3, half wave plate 4, beam expanding lens 5 and fibre-coupled mirrors 6
Ultrashort pulse power and polarization state adjust part, high non-linearity polarization-maintaining photonic crystal fiber 7 and by fiber optic collimator beam expanding lens 8, the
One 50:50 light splitting piece 9, the first reflecting mirror 10, transmissibility of adjustable attenuation piece 11, the second reflecting mirror 12, adjustable space optical delay line 13 and
2nd 50:50 light splitting piece 14 composition spectrum is concerned with and detection part；Wherein
1 output pulse width of femto-second laser is the ultrashort pulse of 40~200fs, linear polarization, is incident to electrically-controlled liquid crystal wave
Piece 2；Ultrashort pulse is incident to polarization beam splitter prism 3, the level of the transmission output of polarization beam splitter prism 3 after electrically-controlled liquid crystal wave plate 2
It is brilliant that linear polarization ultrashort pulse successively enters high non-linearity polarization-maintaining photon through half wave plate 4, beam expanding lens 5 and fibre-coupled mirrors 6
Body optical fiber 7.Wherein electrically-controlled liquid crystal wave plate 2 and polarization beam splitter prism 3, which are applied in combination, may be implemented the ultrashort arteries and veins of transmission level linear polarization
Wash continuously adjusting for power off, rotation half wave plate 4 makes the linear polarization for being coupled into high non-linearity polarization-maintaining photonic crystal fiber 7
Angular bisector of the direction between optical fiber fast axle and slow axis is incident；
7 output end of high non-linearity polarization-maintaining photonic crystal fiber is divided after the output of fiber optic collimator beam expanding lens 8 by the first 50:50
Piece 9 divides for the equal transmission of power and reflects two-beam, and wherein the reflected beams are successively through the first reflecting mirror 10, transmissibility of adjustable attenuation piece 11
It is incident to the 2nd 50:50 light splitting piece 14 with the second reflecting mirror 12, and another transmitted light beam is then same through adjustable space delay line 13
It is incident to the 2nd 50:50 light splitting piece 14 and another beam combiner；
Light beam after the conjunction beam of 2nd 50:50 light splitting piece 14 output is incident to spectroanalysis instrument 16 through optical filter 15.
A kind of measurement method of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh of the invention, including following step
It is rapid:
Step 1: femto-second laser output pulse width is the ultrashort pulse of 40~200fs, linear polarization；
Step 2: when the voltage change that electrically-controlled liquid crystal wave plate is applied, the horizontal line of polarization beam splitter prism transmission output is inclined
Vibration ultrashort pulse optical power changes therewith；
Step 3: continuously adjusting horizontal linear polarization ultrashort pulse, adjust the rotation angle of half wave plate, make to enter height
The polarization direction of the linear polarization ultrashort pulse of non-linear polarization-maintaining photonic crystal fiber is fast along high non-linearity polarization-maintaining photonic crystal fiber
Angular bisector between axis and slow axis is incident；
Step 4: when ultrashort pulse light transmits in high non-linearity polarization-maintaining photonic crystal fiber, while excite fast axis direction and
The soliton self-frequency sh effect of slow-axis direction, and then the soliton of fast axle and slow-axis direction is generated simultaneously；
Step 5: adjusting reference path power, keep reference path optical power and optical path optical power equal；
Step 6: adjusting the time delays of optical path；
Step 7: the degree of oscillation of the interference spectrum of output calculates spectral oscillation according to interference spectrum with the variation of amount of delay
Degree acquire high non-linearity polarization-maintaining photonic crystal fiber output soliton fast axis direction and slow-axis direction relative delay,
Specific processing is as follows:
And then the double refractive inde of optical fiber is calculated, formula is as follows:
nx,ny,νx,νy,tx,ty,
In formula, nx, nyThe effective refractive index of optical fiber fast axle and slow-axis direction is respectively indicated, c indicates the speed of light in a vacuum
Degree, νx, νyIndicate that the light velocity of fast axis direction and slow-axis direction in optical fiber, L indicate used fiber lengths, tx, tyIndicate light point
The time used in the optical fiber that length is L is not passed through along the fast axle of optical fiber and slow axis, Δ t indicates soliton in fast axis direction and slow axis
The relative delay in direction.
Compared with prior art, there are following technical advantages by the present invention:
1) it is continuously tuned on a large scale since soliton wavelength can be realized by the incident ultrashort pulse optical power of control, one
As up to 300nm or more, therefore the present invention can measure the variation of the double refractive inde of optical fiber when wavelength continuously adjusts on a large scale；
2) since soliton itself belongs to ultrashort pulse, there is the spy that pulse width is narrow, peak power is high, energy density is big
Point, therefore the double refractive inde that the present invention measures is double refractive inde of the optical fiber under strong laser field effect, for nonlinear optical fiber
The analysis of polarization-dependent effects has important supporting function in optical field；
3) relative time directly measured between fast axle orphan and slow axis orphan the present invention is based on spectrum coherent approach is poor, leads to
Crossing simple calculate can be obtained fiber birefringence coefficient, not be related to the absolute effective refractive index of optical fiber, measurement result accurately may be used
It leans on；
4) since soliton time width is very narrow, the relative time delay of fast axle orphan and slow axis orphan can be accurate to winged
Second-time, therefore the double refractive inde of very short length optical fiber can be measured.
Detailed description of the invention
Fig. 1 is the measuring device structural schematic diagram of the polarization maintaining optical fibre double refractive inde of the invention based on soliton self-frequency sh；
Fig. 2 is fast axle orphan and slow axis orphan time domain and spectral schematic；
Measured result schematic diagram when spectrum degree of oscillation changes with amount of delay when Fig. 3 is Optical Soliton Wave a length of 900nm.
Appended drawing reference:
1, femto-second laser, 2, electrically-controlled liquid crystal wave plate, 3, polarization beam splitter prism, 4, half wave plate, 5, beam expanding lens,
6, fibre-coupled mirrors, 7, high non-linearity polarization-maintaining photonic crystal fiber, 8, fiber optic collimator beam expanding lens, the 9, the first 50:50 light splitting piece,
10, the first reflecting mirror, 11, transmissibility of adjustable attenuation piece, the 12, second reflecting mirror, 13, adjustable space optical delay line, the 14, the 2nd 50:50 points
Mating plate, 15, optical filter, 16, spectroanalysis instrument；131, the first right-angle reflecting prism, the 132, second right-angle reflecting prism, 133, height
The automatically controlled displacement platform of precision.
Specific embodiment
Technical solution of the present invention is described in further detail in the following with reference to the drawings and specific embodiments, it is described specific
Embodiment is only explained the present invention, is not intended to limit the invention.
As shown in Figure 1, showing for the polarization maintaining optical fibre double refractive inde measuring device structure of the invention based on soliton self-frequency sh
It is intended to.Part, high non-linearity polarization-maintaining photonic crystal fiber, light are adjusted including femto-second laser 1, ultrashort pulse power and polarization state
Spectrum is relevant and detection part, specific work process are as follows:
1 output pulse width of femto-second laser be output pulse width be 40~200fs, the ultrashort pulse of linear polarization, be incident to automatically controlled
Liquid crystal wave plate 2；
Ultrashort pulse power and polarization state adjust part by electrically-controlled liquid crystal wave plate 2, polarization beam splitter prism 3, half wave
Piece 4, beam expanding lens 5 and fibre-coupled mirrors 6 are constituted: linear polarization ultrashort pulse is incident to polarization beam splitting after electrically-controlled liquid crystal wave plate 2
Prism 3, the horizontal linear polarization ultrashort pulse of the transmission output of polarization beam splitter prism 3 is successively through half wave plate 4 and beam expanding lens 5
Afterwards, fibre-coupled mirrors 6 are incident to, the output termination high non-linearity polarization-maintaining photonic crystal fiber 7 of fibre-coupled mirrors 6 is used for space
Ultrashort pulse coupled into optical fibres；, electrically-controlled liquid crystal wave plate 2 and polarization beam splitter prism 3 are applied in combination that transmission level line may be implemented is inclined
Vibration ultrashort pulse optical power continuously adjusts, and rotates the angle of half wave plate 4, adjusts and enters polarization-maintaining high non-linearity photon crystalline substance
The polarization direction of the linear polarization ultrashort pulse of body optical fiber 7 makes angular bisector of the linear polarization ultrashort pulse between fast axle and slow axis
It is incident to high non-linearity polarization-maintaining photonic crystal fiber 7；
Ultrashort pulse exports in high non-linearity polarization-maintaining photonic crystal fiber 7, and soliton self-frequency sh effect occurs, and generates center
Wavelength is with the soliton of incident ultrashort pulse optical power change, and 7 output end of high non-linearity polarization-maintaining photonic crystal fiber is through optical fiber standard
The soliton that optical fiber transmit is converted into spatial light by straight beam expanding lens 8, is concerned with subsequently into spectrum and detection part；
Spectrum is relevant and detection part is divided into reference path and optical path, by fiber optic collimator beam expanding lens 8, the first 50:50
Light splitting piece 9, the first reflecting mirror 10, transmissibility of adjustable attenuation piece 11, the second reflecting mirror 12, adjustable space optical delay line 13 and the 2nd 50:
50 light splitting pieces 14 are constituted: the output light of fiber optic collimator beam expanding lens 8 divides the transmitted light equal for power through the first 50:50 light splitting piece 9
Beam and the reflected beams two parts, wherein the reflected beams are successively through the first reflecting mirror 10, transmissibility of adjustable attenuation piece 11 and the second reflecting mirror 12
It is incident to the 2nd 50:50 light splitting piece 14, this optical path composition spectrum is concerned with and the reference path of detection part；From the first 50:50 points
The transmitted light beam that mating plate 9 exports is incident to adjustable space optical delay line 13, and adjustable space optical delay line 13 is reflected by two right angles
Prism 131,132 and a high precision electric control displacement platform 133 form, and the first right-angle reflecting prism 131 is anti-by incident ultrashort pulse
It is incident upon the second corner cube mirror 132 for being fixed on high precision electric control displacement platform 133, while the second right-angle reflecting prism 132 is anti-
The light pulse come is emitted back towards by its another right-angle side reflection output, high precision electric control displacement platform 133 is for adjusting optical path
Time delay, the ultrashort pulse that adjustable space optical delay line 13 exports are incident to the 2nd 50:50 light splitting piece 14, this optical path constitutes light
Compose the optical path of coherent detection section；
Reflective portion and optical path output beam of the reference path output beam through the 2nd 50:50 light splitting piece 14 are through second
Spectroanalysis instrument 16 is incident to after the transmissive portions division Shu Houjing optical filter 15 of 50:50 light splitting piece 14, detection spectrum is relevant and examines
The variation for surveying degree of oscillation when the interference spectrum of reference path and optical path changes with adjustable space optical delay line in part, from
And determine the relative time delay in 7 output spectrum of high non-linearity polarization-maintaining photonic crystal fiber between fast axle orphan and slow axis orphan, into
And calculate the double refractive inde of high non-linearity polarization-maintaining photonic crystal fiber 7.
Electrically-controlled liquid crystal wave plate 2 can be controlled by external voltage, realize the change of output polarization state.
Half wave plate 4 is used to adjust the linear polarization direction into high non-linearity polarization-maintaining photonic crystal fiber 7, is allowed to
Angular bisector between optical fiber fast axle and slow axis is incident.
Beam expanding lens 5 improves spatial light and is coupled to high non-linearity after fibre-coupled mirrors 6 for realizing the expansion of beam diameter
The coupling efficiency of polarization-maintaining photonic crystal fiber 7.
When ultrashort pulse is transmitted in high non-linearity polarization-maintaining photonic crystal fiber 7, the incidence of ultrashort pulse should be suitably selected
Wavelength enables to generate apparent soliton self-frequency sh effect in high non-linearity polarization-maintaining photonic crystal fiber 7, generates central wavelength
With the soliton of incident ultrashort pulse optical power change.
Transmissibility of adjustable attenuation piece 11 is used to adjust the optical power of reference path, be allowed to the optical power of optical path to close or
It is equal, to improve the relevant degree of spectrum.
Adjustable space optical delay line 13 is used to adjust the time delay of optical path.
Optical filter 14 is used to filter out the remnant pump light pulse of the output of high non-linearity polarization-maintaining photonic crystal fiber 7.
Spectroanalysis instrument 16 should have response in entire orphan's wavelength adjustable range, be connected on a large scale with detecting solitary wave length
Continuous interference spectrum when adjusting with 13 amount of delay of adjustable space optical delay line variation.
A kind of measurement method of polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh proposed by the present invention, this method packet
Include following steps:
Step 1: femto-second laser output pulse width is the ultrashort pulse of 40~200fs, linear polarization；Using linear polarization as water
For flat ultrashort pulse, the polarization state of ultrashort pulse output light after electrically-controlled liquid crystal wave plate can horizontal linear polarization light, it is ellipse partially
Vibration light, circularly polarized light change with the voltage that electrically-controlled liquid crystal wave plate is applied between vertical linearly polarized light；
Step 2: when the voltage change that electrically-controlled liquid crystal wave plate is applied, the horizontal line of polarization beam splitter prism transmission output is inclined
Vibration ultrashort pulse optical power changes therewith；
Step 3: continuously adjusting horizontal linear polarization ultrashort pulse, adjust the rotation angle of half wave plate, make to enter height
The polarization direction of the linear polarization ultrashort pulse of non-linear polarization-maintaining photonic crystal fiber is fast along high non-linearity polarization-maintaining photonic crystal fiber
Angular bisector between axis and slow axis is incident；
Step 4: when ultrashort pulse light transmits in high non-linearity polarization-maintaining photonic crystal fiber, due to soliton self-frequency sh effect
Influence, the generation wavelength soliton mobile to long wave length direction, the increase of Optical Soliton Wave personal attendant's incidence ultrashort pulse optical power
And increase, due to making the ultrashort pulse polarization direction into high non-linearity polarization-maintaining photonic crystal fiber along optical fiber fast axle in the present invention
With the angular bisector direction of slow axis, therefore the soliton self-frequency sh effect of fast axis direction and slow-axis direction can be excited simultaneously, in turn
The soliton for generating fast axle and slow-axis direction simultaneously, since fast axle is identical with slow-axis direction pump power, fiber birefringence effect
Influence to soliton wavelength in soliton self-frequency sh is smaller, therefore the spectrum of the soliton of fast axle and slow-axis direction is approximately uniform
, and due to the influence of fiber birefringence effect, the Propagation of Soliton speed of fast axle and slow-axis direction is different, to cause
Fast axle and the division of the time domain of slow-axis direction soliton；
Step 5: adjusting reference path power, keep reference path optical power and optical path optical power equal；
Step 6: adjusting the time delays of optical path；
Step 7: the degree of oscillation of the interference spectrum of output calculates spectral oscillation according to interference spectrum with the variation of amount of delay
Degree acquire high non-linearity polarization-maintaining photonic crystal fiber output soliton fast axis direction and slow-axis direction relative delay,
And then the double refractive inde of optical fiber is acquired,.
It is as described below that the method for delay time is acquired according to interference spectrum calculating spectral oscillation degree:
The spectral signal that spectroanalysis instrument exports when the two pulses of reference path and optical path are separated from each other is denoted as
Spectral reference curve；Adjustable space optical delay line is gradually adjusted, adjusts record a curve of spectrum every time, until two pulses
After meeting and until completely separable；The every curve of spectrum recorded is made the difference with spectral reference curve and is taken its virtual value,
The virtual value can be used to measure interference spectrum degree of oscillation, then virtual value with the variation of amount of delay be spectral oscillation degree with
The variation of amount of delay.
As shown in figure 3, measured result when spectrum degree of oscillation changes with amount of delay when 900nm a length of for Optical Soliton Wave shows
Be intended to, it can be seen that in actual measurement spectral oscillation degree with amount of delay variation.According to the position of wherein maximum point
The relative time delay Δ t of fast axle orphan and slow axis orphan are acquired, and then according to formula B=nx-ny(L × Δ t) calculates optical fiber to=c/
Double refractive inde, n in formulax, nyRespectively indicate the effective refractive index of optical fiber fast axle and slow-axis direction, c indicates light in a vacuum
Speed, L indicate used fiber lengths.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations
Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention
Within protection.
Claims (3)
1. a kind of measuring device of the polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh, which is characterized in that the device includes
Femto-second laser (1), by electrically-controlled liquid crystal wave plate (2), polarization beam splitter prism (3), half wave plate (4), beam expanding lens (5) and
Fibre-coupled mirrors (6) constitute ultrashort pulse power and polarization state adjust part, high non-linearity polarization-maintaining photonic crystal fiber (7) and
By fiber optic collimator beam expanding lens (8), the first 50:50 light splitting piece (9), the first reflecting mirror (10), transmissibility of adjustable attenuation piece (11), the second reflection
Mirror (12), adjustable space optical delay line 13 and the 2nd 50:50 light splitting piece (14) constitute that spectrum is relevant and detection part；Wherein
Femto-second laser (1) output pulse width is the ultrashort pulse of 40~200fs, linear polarization, is incident to electrically-controlled liquid crystal wave plate
(2)；Ultrashort pulse is incident to polarization beam splitter prism (3) after electrically-controlled liquid crystal wave plate (2), polarization beam splitter prism (3) transmission output
Horizontal linear polarization ultrashort pulse successively enter through half wave plate (4), beam expanding lens (5) and fibre-coupled mirrors (6) it is high non-thread
Property polarization-maintaining photonic crystal fiber (7), wherein electrically-controlled liquid crystal wave plate (2) and polarization beam splitter prism (3) be applied in combination realization transmission water
Horizontal line polarization ultrashort pulse optical power continuously adjusts, and rotation half wave plate (4) makes to be coupled into high non-linearity polarization-maintaining photon
Angular bisector of the linear polarization of crystal optical fibre (7) between optical fiber fast axle and slow axis is incident；
High non-linearity polarization-maintaining photonic crystal fiber (7) output end is after the output of fiber optic collimator beam expanding lens 8 by the first 50:50 light splitting piece
(9) it is divided into the equal transmission of power and reflection two-beam, wherein the reflected beams are successively through the first reflecting mirror (10), transmissibility of adjustable attenuation piece
(11) and the second reflecting mirror (12) is incident to the 2nd 50:50 light splitting piece (14), and another transmitted light beam is then delayed through adjustable space
Line (13) is equally incident to the 2nd 50:50 light splitting piece (14) and another beam combiner；
Light beam after the conjunction beam of 2nd 50:50 light splitting piece (14) output is incident to spectroanalysis instrument (16) through optical filter (15).
2. a kind of measurement method of the polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh, which is characterized in that this method includes
Following steps:
Step 1: femto-second laser output pulse width is the ultrashort pulse of 40~200fs, linear polarization；
Step 2: when the voltage change that electrically-controlled liquid crystal wave plate is applied, the horizontal linear polarization of polarization beam splitter prism transmission output is super
Short light pulse power changes therewith；
Step 3: continuously adjusting horizontal linear polarization ultrashort pulse, adjust the rotation angle of half wave plate, make to enter high non-thread
Property polarization-maintaining photonic crystal fiber linear polarization ultrashort pulse polarization direction along high non-linearity polarization-maintaining photonic crystal fiber fast axle and
Angular bisector between slow axis is incident；
Step 4: when ultrashort pulse light transmits in high non-linearity polarization-maintaining photonic crystal fiber, while exciting fast axis direction and slow axis
The soliton self-frequency sh effect in direction, and then the soliton of fast axle and slow-axis direction is generated simultaneously；
Step 5: adjusting reference path power, keep reference path optical power and optical path optical power equal；
Step 6: adjusting the time delays of optical path；
Step 7: the degree of oscillation of the interference spectrum of output calculates spectral oscillation degree according to interference spectrum with the variation of amount of delay
Acquire high non-linearity polarization-maintaining photonic crystal fiber output soliton in the relative delay of fast axis direction and slow-axis direction, specifically
It handles as follows:
And then the double refractive inde of optical fiber is calculated, formula is as follows:
nx,ny,νx,νy,tx,ty,
In formula, nx, nyThe effective refractive index of optical fiber fast axle and slow-axis direction is respectively indicated, c indicates the speed of light in a vacuum, νx,
νyIndicate that the light velocity of fast axis direction and slow-axis direction in optical fiber, L indicate used fiber lengths, tx, tyIndicate light respectively along light
For fine fast axle and slow axis by the time used in optical fiber that length is L, Δ t indicates soliton in fast axis direction and slow-axis direction
Relative delay.
3. the measurement method of the polarization maintaining optical fibre double refractive inde based on soliton self-frequency sh, feature exist as claimed in claim 2
In wherein according to interference spectrum calculating spectral oscillation degree in the step 7, to acquire high non-linearity polarization-maintaining photonic crystal fiber defeated
Specific step is as follows in the relative delay of fast axis direction and slow-axis direction for soliton out:
The spectral signal that spectroanalysis instrument exports when the two pulses of reference path and optical path are separated from each other is denoted as spectrum
Reference curve；Adjustable space optical delay line is gradually adjusted, adjusts record a curve of spectrum every time, until two pulses meet
Until again completely separable afterwards；The every curve of spectrum recorded is made the difference with spectral reference curve and takes its virtual value, this has
Valid value can be used to measure interference spectrum degree of oscillation, then virtual value is spectral oscillation degree with delay with the variation of amount of delay
The variation of amount.
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| CN112284567A (en) * | 2020-10-19 | 2021-01-29 | 东北大学 | Cascade soliton self-frequency-shift all-fiber sensing system and method for measuring sea water temperature and salt |
| CN112665823A (en) * | 2020-12-14 | 2021-04-16 | 上海大学 | Optical fiber mode time domain energy fluctuation curve measuring device and measuring method |
| WO2023001158A1 (en) * | 2021-07-20 | 2023-01-26 | 广东工业大学 | Optical frequency domain interference-based distributed bidirectional polarization measurement apparatus for optical fiber device |
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| CN112284567B (en) * | 2020-10-19 | 2021-09-21 | 东北大学 | Cascade soliton self-frequency-shift all-fiber sensing system and method for measuring sea water temperature and salt |
| CN112665823A (en) * | 2020-12-14 | 2021-04-16 | 上海大学 | Optical fiber mode time domain energy fluctuation curve measuring device and measuring method |
| CN112665823B (en) * | 2020-12-14 | 2023-09-26 | 上海大学 | Optical fiber mode time domain energy fluctuation curve measuring device and measuring method |
| WO2023001158A1 (en) * | 2021-07-20 | 2023-01-26 | 广东工业大学 | Optical frequency domain interference-based distributed bidirectional polarization measurement apparatus for optical fiber device |
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